package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

/**
 * 用户功能实现类
 */
@Service
@Slf4j
public class UserServiceImpl implements UserService {

    @Autowired
    private WeChatProperties weChatProperties ;
    @Autowired
    private UserMapper userMapper ;

    /**
     * 用户登录
     *
     * @param userLoginDTO
     * @return
     */
    @Override
    public User login(UserLoginDTO userLoginDTO) throws IOException {
        //调用微信接口发送请求获取 openid
        //构造HttpClient的请求体
        Map<String , String> map = new HashMap<>() ;
        map.put("appid" , weChatProperties.getAppid()) ;
        map.put("secret" , weChatProperties.getSecret()) ;
        map.put("js_code", userLoginDTO.getCode()) ;
        map.put("grant_type" , "authorization_code") ;
        String json = HttpClientUtil.doPost("https://api.weixin.qq.com/sns/jscode2session", map);

        //解析响应结果
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid") ;

        //判断 openid 是否为空 为空则表明请求失败 抛出登陆失败异常
        if (openid == null ) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED) ;
        }

        //判断 openid 是否存在
        User user = userMapper.getByOpenid(openid) ;

        //如果不存在就注册用户
        log.info("用户不存在 自动注册...");
        if (user == null) {
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user) ;
        }

        //构造返回结果
        return user ;
    }
}
